Material & not managed in stock on quantity basis

What causes this issue?

You have specified a material belonging to a
<DS:GLOS.material_type>material type</> that is not inventory managed
on a quantity basis in the selected plant.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

INCLUDE NA_EINGABE_PR_FEN

Error message extract from SAP system. Copyright SAP SE.